If he sanctify his field from the year of jubile. — That is, the above-named valuation of fifty shekels only applies if he makes the vow immediately after the expiration of the year of jubile, when the period covered by this estimation is forty-nine years.
Related Commentaries of Leviticus 27:17
Leviticus 27:17
17 If he sanctify his field from the year of jubile, according to thy estimation it shall stand.